/*****************************************************************************
*   "Gif-Lib" - Yet another gif library.				     *
*									     *
* Written by:  Gershon Elber			IBM PC Ver 0.1,	Jun. 1989    *
******************************************************************************
* Handle error reporting for the GIF library.				     *
******************************************************************************
* History:								     *
* 17 Jun 89 - Version 1.0 by Gershon Elber.				     *
*****************************************************************************/

#include <stdio.h>
#include "gif_lib.h"

#define PROGRAM_NAME	"GIF_LIBRARY"

int _GifError = 0;

#ifdef SYSV
static char *VersionStr =
        "Gif library module,\t\tEric S. Raymond\n\
	(C) Copyright 1997 Eric S. Raymond\n";
#else
static char *VersionStr =
	PROGRAM_NAME
	"	IBMPC "
	GIF_LIB_VERSION
	"	Eric S. Raymond,	"
	__DATE__ ",   " __TIME__ "\n"
	"(C) Copyright 1997 Eric S. Raymond\n";
#endif /* SYSV */

/*****************************************************************************
* Return the last GIF error (0 if none) and reset the error.		     *
*****************************************************************************/
int GifLastError(void)
{
    int i = _GifError;

    _GifError = 0;

    return i;
}

/*****************************************************************************
* Print the last GIF error to stderr.					     *
*****************************************************************************/
void PrintGifError(void)
{
    char *Err;

    switch(_GifError) {
	case E_GIF_ERR_OPEN_FAILED:
	    Err = "Failed to open given file";
	    break;
	case E_GIF_ERR_WRITE_FAILED:
	    Err = "Failed to Write to given file";
	    break;
	case E_GIF_ERR_HAS_SCRN_DSCR:
	    Err = "Screen Descriptor already been set";
	    break;
	case E_GIF_ERR_HAS_IMAG_DSCR:
	    Err = "Image Descriptor is still active";
	    break;
	case E_GIF_ERR_NO_COLOR_MAP:
	    Err = "Neither Global Nor Local color map";
	    break;
	case E_GIF_ERR_DATA_TOO_BIG:
	    Err = "#Pixels bigger than Width * Height";
	    break;
	case E_GIF_ERR_NOT_ENOUGH_MEM:
	    Err = "Fail to allocate required memory";
	    break;
	case E_GIF_ERR_DISK_IS_FULL:
	    Err = "Write failed (disk full?)";
	    break;
	case E_GIF_ERR_CLOSE_FAILED:
	    Err = "Failed to close given file";
	    break;
	case E_GIF_ERR_NOT_WRITEABLE:
	    Err = "Given file was not opened for write";
	    break;
	case D_GIF_ERR_OPEN_FAILED:
	    Err = "Failed to open given file";
	    break;
	case D_GIF_ERR_READ_FAILED:
	    Err = "Failed to Read from given file";
	    break;
	case D_GIF_ERR_NOT_GIF_FILE:
	    Err = "Given file is NOT GIF file";
	    break;
	case D_GIF_ERR_NO_SCRN_DSCR:
	    Err = "No Screen Descriptor detected";
	    break;
	case D_GIF_ERR_NO_IMAG_DSCR:
	    Err = "No Image Descriptor detected";
	    break;
	case D_GIF_ERR_NO_COLOR_MAP:
	    Err = "Neither Global Nor Local color map";
	    break;
	case D_GIF_ERR_WRONG_RECORD:
	    Err = "Wrong record type detected";
	    break;
	case D_GIF_ERR_DATA_TOO_BIG:
	    Err = "#Pixels bigger than Width * Height";
	    break;
	case D_GIF_ERR_NOT_ENOUGH_MEM:
	    Err = "Fail to allocate required memory";
	    break;
	case D_GIF_ERR_CLOSE_FAILED:
	    Err = "Failed to close given file";
	    break;
	case D_GIF_ERR_NOT_READABLE:
	    Err = "Given file was not opened for read";
	    break;
	case D_GIF_ERR_IMAGE_DEFECT:
	    Err = "Image is defective, decoding aborted";
	    break;
	case D_GIF_ERR_EOF_TOO_SOON:
	    Err = "Image EOF detected, before image complete";
	    break;
	default:
	    Err = NULL;
	    break;
    }
    if (Err != NULL)
	fprintf(stderr, "\nGIF-LIB error: %s.\n", Err);
    else
	fprintf(stderr, "\nGIF-LIB undefined error %d.\n", _GifError);
}
